how many four digit odd numbers can you construct from 1,2,3,5

Question

Question

Answer 1

Answer #1

Last blank can be filled in 3 ways {1,3,5}> 3

First blank can be filled with any one of the remaining 3 number

2nd blank can be filled with any one of the remaining 2 number

And 3rd blank Can be filled with remaining 1 number

3*3*2*1=18

Answer 2

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